Small A/C Unit (5000 BTU) For Campers and Vans

One other option I also looking into (just an added FYI) is gutting a standard 13500BTU roof unit and replacing the internals with a compressor from a 5000BTU unit so I can keep running my little generator for my small camper. A very trusted AC tech told me that was very possible.... but I stuck with a wall unit simply because I didn't have time, tools, and parts on my side once I crossed the mexican border heading south!